Don't worry about your car being clean. The area is in an idustrial park. Cars are parked around Mequiars in an L shape if I recall correctly. There are cars around from other business as well. The teacher after the classroom instruction will take everyone out to the parking lot garage area and will just look around quickly for a rather cobwebed and or swirl marked car to pick for demo purposes. Hes not looking for a clean car, just not dirty. He will probably take the trunk lid and do a small square section with the Mequiars orbital sander/polisher to demo. If you look around you will see Homedepot stand lights and DeWalt high speed polisher as well. But he won't demo the high speed polisher.